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Subject
- absolute magnitude7
- accretion1
- active galactic nuclei54
- apparent magnitude8
- astrometry2
- astronomical models1
- astronomical object identification23
- atomic spectroscopy1
- bl lacertae objects8
- black holes1
- catalogs29
- ccd photometry1
- chemical abundances4
- extinction12
- galaxies136
- galaxy classification systems11
- galaxy clusters34
- galaxy kinematics4
- gamma-ray astronomy7
- gamma-ray bursts1